Alt-BEAM Archive
Message #13701
To: beam@sgiblab.sgi.com
From: Ian synet@psynet.net
Date: Wed, 19 Apr 2000 20:17:59 -0600
Subject: Re: BiCore Occilator (Another idea)
Hi, I tried the thing with the speaker once. Kinda neat. Anyway I thought of
another use for a bicore the other day. I'm helping work on a couple walkers
as part of a graduate project and we need four IR proximity sensors. Anyway
I found some designs on the net for 40K emitters but all were fairly
complex. After building a few of them, none of which gave us very good
results, an idea popped into my head. What don't we just use a bicore! We
built the standard bicore with .11uF caps (two .22's is series) and a 5k pot
in parallel with a 1.8K resister. With the help of an oscilloscope (not
really needed) we got it tuned up and now we get excellent results. The
sensor can detect objects about 1 foot away and even more if we decreased
the 1K resister in series with the IR emitter. BTW: We're using U60 (?) IR
detectors right now but may switch to the modules sold by Jameco. They seem
to be more resistant to ambient light.
Just thought some of you might be interested in this.
Laterz
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